Status report / Activity Plan of Evap Task Force

Transcription

1 WLTP-20-06e rev Status report / Activity Plan of Evap Task Force 26 th Sep., 2017 Mayumi Sophie Morimoto (JASIC)

2 Status & Schedule The discussion on drafting sealed fuel tank system test procedure (GTR 19 amendment 1) is completed. Improved the flowchart and made it consistent with text. Reviewed numbering of paragraphs to make it easier to read. Slightly modified the description of audit/witness tests to make it clear. The test procedure of semi-sealed fuel tank system, bi-fuel gas vehicles, and other issues will be discussed at next stage, after January GRPE meeting. 1/ Jan Feb Mar Apr May Jun July Aug Sep Jan GRPE IWG #74 GRPE 10 WLTP #17 GRPE approved EVAP GTR w/o sealed tank sys. test procedure WLTP # #75 GRPE Submit draft GTR as Informal document 6 WLTP #19 TODAY WLTP # #76 GRPE Get approval of revised EVAP gtr TF Face 2 Face Face 2 Face Face 2 Face Get IWG approval of sealed tank sys. test procedure after drafting. 11

3 Changes on Flow Chart Before (WLTP-19-07e_Appendix) Separate flow chart among with different systems. After (WLTP-20-06e_appendix) One comparable flow chart. Added paragraph numbers. 2/5 Consolidated the flow chart (Thanks to Bill-san)

4 Deleted the Description of Audit/Witness Tests Before (WLTP-19-07e_Appendix) After (WLTP-20-06e_rev_appendix) 3/5 5.6 The responsible authority shall not grant type approval if the information provided is insufficient to demonstrate that the evaporative emissions are effectively limited during the normal use of the vehicle. The responsible authority may audit or witness any part of the tests described in Annex 1, or if there is reasonable doubt regarding the efficiency of the evaporative controls, request to repeat any part of the tests described in annex 1. *Paragraph 5.6 was added in GTR19 Amendment The responsible authority shall not grant type approval if the information provided is insufficient to demonstrate that the evaporative emissions are effectively limited during the normal use of the vehicle. The responsible authority may audit or witness also the part of the tests which are not performed at the manufacturer site, such as the carbon canister ageing or the determination of the permeability factor, or if there is reasonable doubt regarding the efficiency of the evaporative controls, request to repeat any part of the tests described in Annex 1. The description of audit/witness test were left out and leave this to CP.

5 Main Discussion Points on Technical Issues and Conclusion Discussion Points Conclusion 4/5 A: Test sequence Whether to make the test sequence on 1 flow or have separate flows. Keep both as options; Option 1: 1 flow Option 2: separate flow on measurement of puff loss and DBL B: Condition before puff loss loading 20 C to 35 C, using first 11 hours of DBL C: How to measure depressurisation puff loss overflow By auxiliary canister or by SHED D: Relief Pressure Requirement of sealed fuel tank E: Limit for overflow puff loss emissions after the tank depressurization F: Requirement of tank pressure before refueling G: Definition of sealed fuel tank system (Re-opened issue) Whether to include BMW proposed semi-sealed fuel tank system or not. H: Selection of test vehicle within EVAP family (Re-opened issue) Keep 2 options Measure by auxiliary canister or SHED Relief pressure shall be 30 kpa or more. If less, do DBL tests on C to 38 C Result of measurement should not be changed within the tolerance of ± 0.5 gram. Fully depressurised to reach a pressure less than 2.5 kpa above ambient pressure in normal vehicle operation and use. Kept as current A fuel tank system where the fuel vapours do not vent during parking over the 24-hour diurnal cycle. Worst case vehicle. However use the road load setting of the interpolation family vehicle H with the highest cycle energy demand in the EVAP family.

6 Conclusions After intensive and many fruitful discussions among experts since 2016, 5/5 ALL missions EVAP TF initially had are COMPLETED successfully. GTR 19 amendment 1 (WLTP-20-06e_Appendix) will be submitted as GRPE working document. This document is expected to be reviewed and approved during 78 th GRPE session.

7 Thank you very much for your attention!

8 Feature of Sealed Tank System and New Words Puff loss Canister Depressurisation puff loss overflow Fuel vapours leaked from puff loss canister 2 Depressurisation puff loss Fuel vapours flows into canister before refueling 1 Relief Pressure Valve Kept closed during parking and opens before refueling 1 No fuel vapour flow into the canister during parking because the control valve kept closed. 2 Fuel vapour into the puff loss canister only before refueling. (The relief pressure valve opens when the refueling event starts, then closes after tank pressure goes down.)

9 Discussion points of Sealed Tank System Test Procedure Non Sealed Tank System Test procedure G Sealed Tank System Test Procedure Fuel drain and refill Pre-conditioning A A series of procedure OR Separate procedure for puff loss loading volume 2g breakthrough to be replaced by puff loss loading. Soak 23 +/- 3 C Drain and refill 15% refill Canister loading 2g breakthrough Tank pressure relief Canister loading by opening fuel lid and/or cap 2g breakthrough Canister purge 85% fuel consumed equivalent Test drive Hot Soak Soak WLTC purge cycle Min 23 C / Max 31 C for 60 min 23 +/- 3 C Soak inside SHED Canister loading Fuel drain and refill temperature, duration,,, loading by opening the fuel lid overflow vapor limit 40% refill to be consisted with non-sealed system C B F E 1 st and 2 nd day Diurnal Start 20 C to Max 35 C 24 hrs for 2days Battery fully charge OVC-HEV only H Selection of test vehicle D Relief Pressure Requirement for Sealed Tank System